Add: Doc for 6-Mics Circular Array Kit & 4-Mics Linear Array Kit
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Peter.Yang
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README.md
109
README.md
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@ -95,6 +95,101 @@ pi@raspberrypi:~ $
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```
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If you want to change the alsa settings, You can use `sudo alsactl --file=/etc/voicecard/ac108_asound.state store` to save it.
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## 6-Mics Circular Array Kit for Raspberry Pi
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The 6 Mics Circular Array Kit uses ac108 x 2 / ac101 x 1 / 6 micphones, includes 8 ADCs and 2 DACs.
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The driver is implemented with 8 input channels & 8 output channels.
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>**The first 6 input channel are MIC recording data,
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the rest 2 input channel are echo channel of playback
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The first 2 output channel are playing data, the rest 6 output channel are dummy**
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Check that the sound card name matches the source code seeed-voicecard.
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```bash
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#for ReSpeaker 6-mic
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pi@raspberrypi:~ $ arecord -L
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null
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Discard all samples (playback) or generate zero samples (capture)
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default
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playback
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dmixed
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ac108
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multiapps
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ac101
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sysdefault:CARD=seeed8micvoicec
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seeed-8mic-voicecard,
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Default Audio Device
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dmix:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Direct sample mixing device
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dsnoop:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Direct sample snooping device
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hw:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Direct hardware device without any conversions
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plughw:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Hardware device with all software conversions
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pi@raspberrypi:~ $ aplay -L
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null
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Discard all samples (playback) or generate zero samples (capture)
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default
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playback
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dmixed
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ac108
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multiapps
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ac101
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sysdefault:CARD=ALSA
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bcm2835 ALSA, bcm2835 ALSA
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Default Audio Device
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dmix:CARD=ALSA,DEV=0
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bcm2835 ALSA, bcm2835 ALSA
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Direct sample mixing device
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dmix:CARD=ALSA,DEV=1
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bcm2835 ALSA, bcm2835 IEC958/HDMI
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Direct sample mixing device
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dsnoop:CARD=ALSA,DEV=0
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bcm2835 ALSA, bcm2835 ALSA
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Direct sample snooping device
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dsnoop:CARD=ALSA,DEV=1
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bcm2835 ALSA, bcm2835 IEC958/HDMI
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Direct sample snooping device
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hw:CARD=ALSA,DEV=0
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bcm2835 ALSA, bcm2835 ALSA
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Direct hardware device without any conversions
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hw:CARD=ALSA,DEV=1
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bcm2835 ALSA, bcm2835 IEC958/HDMI
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Direct hardware device without any conversions
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plughw:CARD=ALSA,DEV=0
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bcm2835 ALSA, bcm2835 ALSA
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Hardware device with all software conversions
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plughw:CARD=ALSA,DEV=1
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bcm2835 ALSA, bcm2835 IEC958/HDMI
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Hardware device with all software conversions
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sysdefault:CARD=seeed8micvoicec
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seeed-8mic-voicecard,
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Default Audio Device
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dmix:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Direct sample mixing device
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dsnoop:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Direct sample snooping device
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hw:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Direct hardware device without any conversions
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plughw:CARD=seeed8micvoicec,DEV=0
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seeed-8mic-voicecard,
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Hardware device with all software conversions
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```
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## 4-Mics Linear Array Kit for Raspberry Pi
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In contrast to 6-Mics Circular Array Kit for Raspberry Pi,
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the difference is only first 4 input channels are valid capturing data.
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#### Test:
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```bash
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#for ReSpeaker 2-mic
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@ -107,6 +202,20 @@ arecord -f cd -Dhw:1 | aplay -Dhw:1
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#It will capture sound on AC108 and save as a.wav
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arecord -Dac108 -f S32_LE -r 16000 -c 4 a.wav
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```
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```bash
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#for ReSpeaker 6-mic
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#It will capture sound on AC108 and save as a.wav
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arecord -Dac108 -f S32_LE -r 16000 -c 8 a.wav
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#Take care of that the captured mic audio is on the first 6 channels
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#It will play sound file a.wav on AC101
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aplay -D ac101 a.wav
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#Do not use -D plughw:1,0 directly except your wave file is single channel only.
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```
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**Note: for developer using ReSpeaker 6-mic doing capturing & playback the same time,
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capturing must be start first, or else the capturing channels will miss order.**
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### uninstall seeed-voicecard
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If you want to upgrade the driver , you need uninstall the driver first.
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@ -1,6 +1,35 @@
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# The IPC key of dmix or dsnoop plugin must be unique
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# If 555555 or 666666 is used by other processes, use another one
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pcm.!default {
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type asym
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playback.pcm "ac101"
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capture.pcm "ac108"
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}
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pcm.respeaker {
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pcm.playback {
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type plug
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slave.pcm "hw:0,0"
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}
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pcm.dmixed {
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type dmix
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slave.pcm "hw:0,0"
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ipc_key 555555
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}
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pcm.ac108 {
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type plug
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slave.pcm "multiapps"
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}
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pcm.multiapps {
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type dsnoop
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slave.pcm "hw:1,0"
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ipc_key 666666
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}
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pcm.ac101 {
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type plug
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slave {
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pcm {
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@ -29,3 +58,4 @@ pcm.respeaker {
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}
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}
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